P<sub>+</sub> = Hρ<sub>1</sub>g+ hρ<sub>1</sub>g+P<sub>0</sub> P<sub>-</sub> = P<sub>0</sub><br>ΔP= P<sub>+</sub>- P<sub>-</sub> = Hρ<sub>1</sub>g+ hρ<sub>1</sub>g+P<sub>0</sub>- P<sub>0</sub> = Hρ<sub>1</sub>g+hρ<sub>1</sub>g<br>when H=0, ΔP=hρ<sub>1</sub>g<br>所以,需要零点迁移,迁移量为 hρ<sub>1</sub>g.<br>变送器量程为 H<sub>max</sub>ρ<sub>1</sub>g.
P+ = Hρ1g+ hρ1g+P0 P- = P0ΔP= P+- P- = Hρ1g+ hρ1g+P0- P0 = Hρ1g+hρ1gwhen H=0, ΔP=hρ1g所以,需要零点迁移,迁移量为 hρ1g.变送器量程为 Hmaxρ1g.
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